Does constant charging weaken a lithium battery?

Question

Take for instance a typical cell phone battery, or iPod internal battery...Would charging it when it is already full (for every night/every other night) shorten the battery's life or weaken it in any way?

Answer 1

Lithium batteries are not designed to be charged constantly like Ni-cads or Nimh batteries. However, lithium batteries also do not suffer from the memory effect that Ni-cads do. Like all other rechargeable batteries Lithium batteries have a finite amount of charge/discharge cycles. What is different with Lithium batteries is that a partial discharge then charge is only counted as a percentage of a charge/discharge cycle. Thus if you ran it down to 80% of full charge and then charged it up it would count as 20% of one charge/discharge cycle. What people have found is that discharging a lithium battery fully actually shortens the life of the battery.

Here are two sites that talk about lithium batteries....

http://en.wikipedia.org/wiki/Lithium_ion_battery

http://www.batteryuniversity.com/parttwo-34.htm

Answer 2

Constant charging is not good for any battery. That is why most people leave their laptop plugged in, and after a year or so, they go with battery, and find the thing goes dead in short time.!! It is always good to 'cycle' a battery to keep it in good shape.

Answer 3

Yes over charging does has a negative effect on the battery..!!! It shortents it life and if it a mobile, the battery go low very frequently.....!!!!!

Answer 4

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